In geometry, the perpendicular symbol is used to show that two lines are perpendicular to eachother. Visually, the symbol is made up of two lines which form a perpendicular angle.
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A perpendicular angle is visually denoted by drawing a square at the vertex of the angle. The measured angle is equal to π/2 radians or 90°.
The symbol for two perpendicular lines is a horizontal line with another line drawn perpendicular to it.